Once installed, automator actions will be available in the 'Automator' submenu of the Finder's contextual menu

If you select a folder and you choose 'Index with Spotlight', you will force spotlight to index that folder

Mac OS X 10.4 Tiger is required. To install the plugins, move them into the folder "Library:Workflows:Applications:Finder" inside your home folder, or just run the 'install plugins' applescript which will do the same for you.